High efficiency low energy consumption urban sewage dephosphorization denitrification treatment method

Abstract

The invention provides an urban sewage dephosphorization denitrification treatment method, relating to a sewage treatment technology. The invention discloses a high efficiency low energy consumption urban sewage dephosphorization denitrification treatment method. The treatment method includes the following steps: urban sewage after pre-treatment and digested sludge refluxed by an anaerobic sludge digestion unit enter into an anaerobic reactor, and biochemical reaction is taken place; effluent of the anaerobic reactor, mixed liquid refluxed by an aerobic reactor and returned sludge enter into an anoxic reactor, and biochemical reaction such as denitrification is taken place; one part of effluent of the anoxic reactor enters into the aerobic reactor, and the other part returns to the anaerobic reactor; mixed liquid of effluent of the aerobic reactor enters into a secondary sedimentation tank, and mud and water are separated; and residual activated sludge is concentrated and then discharged to the anaerobic sludge digestion unit to be digested. The anaerobic sludge digestion unit digests sludge under anaerobic condition, one part of digested sludge returns to the anaerobic reactor or anoxic reactor or aerobic reactor, and the other part of digested sludge is dehydrated, and then sludge treatment is carried out.

Description

technical field [0001] The invention belongs to a sewage treatment technology, and in particular relates to a low-energy consumption phosphorus and nitrogen removal treatment method for urban sewage. Background technique [0002] With the rapid development of my country's national economy and the continuous acceleration of urbanization, the amount of urban domestic sewage has also increased significantly, and exceeded the discharge of industrial wastewater for the first time in 1999, accounting for 52.9% of the total sewage discharge in the country. In recent years, the amount of domestic sewage in cities and towns has been increasing at an average annual rate of 5%, and has become the main pollution source of my country's water environment. Urban sewage treatment is one of the industries with high energy consumption. On the one hand, high energy consumption leads to higher sewage treatment costs, and on the other hand, it also exacerbates my country's current energy crisis...

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Problems solved by technology

Municipal sludge has high water content, bulky volume, organic matter content as high as 50% to 70%, and unstable properties

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